A vow to break?
She's a bullet point on the list of things he's agreed to for duty. And as it is the only way to restore order in Dahaar and quash whispers that name him The Mad Prince, Ayaan Al Sharif will marry Zohra Naasar.
Zohra knows something of duty's destruction--it's stolen her freedom before, and it won't happen again. She'll convince Ayaan not to marry her--by refusing to sleep with him! Even if he does evoke a desire she's never felt before.
Ayaan may have agreed to her outrageous demand, but is this the one promise the last prince of Dahaar can't keep?